Main Entry: roll·er coast·er

Pronunciation: \ˈrō-lər-ˌkō-stər, ˈrō-lē-ˌkō-\

Function: noun

Date: 1884

1 : an elevated railway (as in an amusement park) constructed with sharp curves and steep inclines on which cars roll
2 : something resembling a roller coaster; especially : behavior, events, or experiences characterized by sudden and extreme changes <an emotional roller coaster>